} else {
            variantKey = new VariantKey(identifier, target);
        }

        // Can't use computeIfAbsent() as the default implementation does not allow recursive updates
        ResolvedArtifactSet result = variants.get(variantKey);
        if (result == null) {

        if (substitutionResultMap == null) {
            substitutionResultMap = new HashMap<>();
        }
        return substitutionResultMap.computeIfAbsent(substitutionResult, mappingFunction);
    }

            // It might be better to tighten this up by either requiring a single artifactType registry for the entire build or eliminating this feature
            // entirely.
            return resolvedVariantCache.computeIfAbsent(new VariantWithOverloadAttributes(identifier, attributes), id -> {
                DisplayName displayName = variant.asDescribable();

        ResolutionFailureDescriber<?> describer = instanceGenerator.newInstance(describerType);
        describers.computeIfAbsent(failureType, k -> new ArrayList<>()).add(describer);
    }

        }

        @SuppressWarnings("unchecked")
        public <T> Provider<T> scope(Key<T> key, Provider<T> unscoped) {
            Provider<?> provider = provided.computeIfAbsent(key, k -> new CachingProvider<>(unscoped));
            return (Provider<T>) provider;
        }

        public Collection<CachingProvider<?>> providers() {
            return provided.values();
        }
    }

        JavaToolchainSpecInternal.Key actualKey = useFallback ? FALLBACK_TOOLCHAIN_KEY : requestedSpec.toKey();

        Object resolutionResult = matchingToolchains.computeIfAbsent(actualKey, key -> {
            try {
                return query(actualSpec, useFallback);
            } catch (Exception e) {
                return e;
            }
        });

        apiTypesBySourceName.computeIfAbsent(sourceName) {
            repository.classBytesFor(sourceName)?.let { apiTypeFor(sourceName) { it } }
        }?.invoke()
    }

    internal
    fun allTypes(): Sequence<ApiType> = open {
        repository.allClassesBytesBySourceName().map { (sourceName, classBytes) ->
            apiTypesBySourceName.computeIfAbsent(sourceName) {

            throws ArtifactDescriptorException {
        Relocations relocations = (Relocations) session.getData()
                .computeIfAbsent(getClass().getName() + ".relocations", () -> parseRelocations(session));
        if (relocations != null) {
            Artifact original = artifactDescriptorResult.getRequest().getArtifact();

                project.getRemoteProjectRepositories(),
                scopesToCollect,
                scopesToResolve,
                aggregating,
                session);
        return keys.computeIfAbsent(key, k -> k);
    }

    @Override
    public CacheRecord get(Key key) throws LifecycleExecutionException {
        CacheRecord cacheRecord = cache.get(key);

        merged.keySet().removeAll(changedClasses);
        for (Map.Entry<String, Set<String>> entry : newSourceClassesMapping.entrySet()) {
            merged.computeIfAbsent(entry.getKey(), key -> new HashSet<>()).addAll(entry.getValue());
        }
        return merged;
    }

    private AnnotationProcessingData getAnnotationProcessingData(JavaCompileSpec spec, WorkResult result) {